package com.Fen.service.impl;

import com.Fen.context.BaseContext;
import com.Fen.dto.ShoppingCartDTO;
import com.Fen.entity.Dish;
import com.Fen.entity.Setmeal;
import com.Fen.entity.ShoppingCart;
import com.Fen.mapper.DishMapper;
import com.Fen.mapper.SetmealMapper;
import com.Fen.mapper.ShoppingCartMapper;
import com.Fen.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断加入购物车的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);

        //存在，numbwr+1
        if(list.size()>0&&list!=null){
            ShoppingCart shoppingCart1 = list.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        }else {
            //不存在，新增
            Long dishId=shoppingCartDTO.getDishId();
            Long setmealId=shoppingCartDTO.getSetmealId();
            if(dishId!=null){
                Dish dish= dishMapper.selectById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                Setmeal setmeal= setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {

        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                        .userId(userId)
                                .build();
       List<ShoppingCart> shoppingCarts= shoppingCartMapper.list(shoppingCart);
       return shoppingCarts;
    }

    @Override
    public void cleanShoppingCart() {
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
